Comparison of CFD and DSMC using calibrated transport parameters

D. S. Liechty, A. J. Wise, S. Subramaniam, K. A. Stephani

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Hypersonic reentry flows span a wide range of length scales where regions of both rarefied and continuum flow exist. Traditional computational fluid dynamics (CFD) techniques do not provide an accurate solution for the rarefied regions of such 'mixed' flow fields. Although direct simulation Monte Carlo (DSMC) can be used to accurately capture both the continuum and rarefied features of 'mixed' flow fields, they are computationally expensive when employed to simulate the low Knudsen number continuum regimes. Thus, a hybrid framework for seamlessly combining the two methodologies, CFD and DSMC, continues to be a topic of significant research effort. Ensuring consistency in the reaction kinetics and transport models employed within CFD and DSMC is a crucial requirement for obtaining a reliable solution from a hybrid framework for combined continuum/rarefied high speed flows. This paper represents one of the first studies to utilize the calibrated transport parameters developed to ensure consistency between CFD and DSMC solvers. The new variable soft sphere (VSS) parameters are compared to both previous "standard" variable hard sphere (VHS) parameters and also to solutions from the CFD transport properties that the new parameters were developed to reproduce.

Original languageEnglish (US)
Title of host publication31st International Symposium on Rarefied Gas Dynamics, RGD 2018
EditorsDuncan Lockerby, David R. Emerson, Lei Wu, Yonghao Zhang
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735418745
StatePublished - Aug 5 2019
Event31st International Symposium on Rarefied Gas Dynamics, RGD 2018 - Glasgow, United Kingdom
Duration: Jul 23 2018Jul 27 2018

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference31st International Symposium on Rarefied Gas Dynamics, RGD 2018
Country/TerritoryUnited Kingdom

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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